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No ‘smoking gun’ for Alaskan Chinook declines

Jones et al. (2020). Global Change Biology 26:4919-36.

A new study challenges the view that adverse marine conditions have driven the past decade of Chinook salmon declines in Alaska. Instead, the study points to watershed-scale freshwater conditions and the cumulative effects of multiple environmental drivers as contributing factors to productivity declines. Check out the Science Spotlight.

Habitat refuges crucial in streams with low summer flows

Vander Vorste et al. (2020). Global Change Biology 26:3834-45.

Throughout much of California, Pacific salmon populations have been reduced to fractions of their former abundance. Although human-driven environmental changes threaten all of California’s remaining salmon runs, stocks that reproduce in intermittent streams may be especially at risk. Check out the Science Spotlight.

Review provides body of evidence that estuary development can put juvenile salmon at risk

Hodgson et al. (2020). Global Change Biology 26:1986-2001.

A recent literature review—the first to systematically review studies of estuary development impacts on juvenile salmon—has identified multiple activities and stressors with likely negative impacts. Pollutants, habitat modification, and sea lice are among the activities and stressors that consistently pose moderate-to-high risks to juvenile salmon.  Check out the Science Spotlight.

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